Latest update to wiki --> mess!

I just updated to the latest version of the wiki.

NONE of the links in the breadcrumbs work - they all go to a 404 now! In the URL of each wiki page instead of 'wiki', its is now 'incsub_wiki'

Also now at the bottom of each wiki page is an author box for 'Admin' and a box with a message to subscribe to update via RSS - how do I get rid of those two boxes?

How do I revert the latest update back to a previous version???